spi_sync函数的返回类型是int。 返回值含义: 当spi_sync函数成功完成数据传输时,它返回0。 如果在数据传输过程中发生错误,它会返回一个负的错误码。这个错误码可以用来判断具体发生了哪种类型的错误。 在不同情况下的返回值: 成功传输:返回0。 传输错误:返回一个负值,具体的错误码取决于错误类型,例如设备忙、...
exit_sync_config();spi_dma_sync_config();之后,按下按键,就可以触发DMA传输,测试如下:上面配置...
因为spi_sync函数是发起一个同步传输的阻塞API。它会通过master->transfer把spi_message结构挂在spi_master的queue字段下,然后启动专门为spi传输准备的内核工作线程spi_pump_messages,把spi_message从队列中移除,然后调用master->prepare_transfer_hardware回调来让控制器驱动准备必要的硬件资源,最后master->...
4. **数据传输方向**:确保在Spi_SyncTransmit函数中,数据传输方向设置正确。如果设置错误,可能导致...
Android7.0,编写一个SPI驱动程序,混杂设备的写数据函数中 spi_sync函数返回-22,内核打印提示 ...
Android7.0,编写一个SPI驱动程序,混杂设备的写数据函数中 spi_sync函数返回-22,内核打印提示 ...
It seems "spi_sync" never returns. The bug occurs randomly after a few hours of correct behavior. Could it be a locking problem? Any idea? I have seen @zhoushix's commits about SPI+DMA. However, if I enable dma for mcp151x or for spidev, the mcp151x driver can't access the con...
在ADS8688的数据手册中,SPI接口的时序图和操作步骤如下:1. 将/SYNC(同步)信号拉低。2. 发送通道...
spi_message_init_with_transfers(&msg, xfers, index); return spi_sync(spi, &msg); return spi_sync_transfer(spi, xfers, index); } static int ocelot_spi_regmap_bus_write(void *context, const void *data, size_t count) 0 comments on commit 74d26d7 Please sign in to comment. Footer...
In the probe function of module_spi_driver, after spi_setup(spi), I called spi_write_then_read function in which spi_sync is called. Then tegra_spi_transfer_one_message function in file spi-tegra114.c is called. After t…